package com.atguigu.yygh.common.helper;

import io.jsonwebtoken.*;
import org.springframework.util.StringUtils;

import java.util.Date;


public class JwtHelper {

    private static long tokenExpiration = 10 * 365 * 24 * 60 * 60 * 1000;
    private static String tokenSignKey = "123456";


    public static String createToken(Long userId, String userName) {
        String token = Jwts.builder()
                .setSubject("P2P-USER")
                .setExpiration(new Date(System.currentTimeMillis() + tokenExpiration))
                .claim("userId", userId)
                .claim("userName", userName)
                .signWith(SignatureAlgorithm.HS512, tokenSignKey)
                .compressWith(CompressionCodecs.GZIP)
                .compact();
        return token;
    }

    public static Long getUserId(String token) {


        Claims claims;
        Integer userId = 1;
        try {
            claims = Jwts.parser()
                    .setSigningKey(tokenSignKey) // 设置标识名
                    .parseClaimsJws(token)  //解析token
                    .getBody();
        } catch (ExpiredJwtException e) {
            claims = e.getClaims();
        }
        userId = (Integer) claims.get("userId");
        return userId.longValue();
        // return 1L;
    }

    public static String getUserName(String token) {
        if (StringUtils.isEmpty(token)) return "";

        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
        Claims claims = claimsJws.getBody();
        return (String) claims.get("userName");
    }

    public static void removeToken(String token) {
        //jwttoken无需删除，客户端扔掉即可。
    }

    public static void main(String[] args) {
        String token = JwtHelper.createToken(1L, "admin");
        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(tokenSignKey).parseClaimsJws(token);
        System.out.println(claimsJws);
        System.out.println(token);
        System.out.println(JwtHelper.getUserId(token));
        System.out.println(JwtHelper.getUserName(token));
    }
}

